【摘要】 气态膜是以蒸气压差为驱动力的膜分离技术,不仅适用于从水溶液中分离和提取挥发性无机物质,而且也适用于从水溶液中分离和回收某些挥发性有机物质。本文以含酚水为对象,系统地研究了酚通过聚四氟乙烯平板型气态膜的迁移特性及其影响因素。更多还原

【Abstract】 The gas membrane is a membrane separation method which can beused to separate volatile substances from dilute aqueous solution.Inthis paper,mass transfer process and influence factors of phenolthrough the gas membrane supported by a flat microporous hydro-phobic Teflon film have been described。The mass transfer coefficient of 1.34×10^-4cm/s was examined at25℃.The experiment results show that mass transfer process of phenolis akin to that of inorganic volatile substances,such as NH₃,Cl₂,Br₂,I₂,H₂S,SO₂.It is also first order kinetic process.In all influence factors,the effect of temperature on the mass transfer coefficient ofphenol is remakable.The linear relationship between natural logarithmof mass transfer coefficient and negative reciprocal of absplute tem-perature was obtained.The effect of concentration and content in thestripping solution is negligible.It is also possible that selective separation phenol in the form ofsodium phenate from mixing solution containing phenol and formalde-hyde,because the value of separation coefficient is not equal to 1.更多还原